Thanks for the help guys. That has cleared things up. I'll put a bit of red sparky around the cables to help identify it in the future. I'll also read all that information to make I don't royally balls something up!
I'm trying to replace the hanging light below and I've gotten a little confused. Shouldn't the brown wire on the left be connected to the live (red) wires rather than the neutral?
I understand that the black wires on the right are connected to the blue wire, both are neutral so that makes...